Continuous aerosol monitoring device and monitoring method for acid-proof iodine-129

Abstract

The invention belongs to the technical field of aerosol monitoring, and particularly relates to an aerosol continuous monitoring device and a monitoring method for acid-proof iodine-129. The aerosol continuous monitoring device comprises a machine body, a ventilation assembly is arranged in an inner cavity of the machine body, an exhaust assembly is arranged on the machine body, a monitoring assembly is arranged in the machine body, and a cleaning assembly is arranged in the monitoring assembly; the ventilation assembly comprises a pipeline assembly arranged in the machine body, and a channel changing assembly is arranged in the pipeline assembly; the monitoring assembly comprises a driving assembly arranged in the machine body, and a solution assembly is arranged in the machine body; and the cleaning assembly comprises a washing assembly arranged in the machine body, and a liquid discharging assembly is arranged at the bottom of the solution assembly. According to the invention, different monitoring samples can be continuously monitored, and a filter medium, a solution storage part and a gas sample are reversely cleaned after solution monitoring, so that the influence on the accuracy of subsequent monitoring is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of aerosol monitoring, and in particular relates to an aerosol continuous monitoring device and a monitoring method for acid-proof iodine-129. Background Art

[0002] During the operation of nuclear power plants, aerosol monitoring is extremely important. Radioactive aerosols that may be produced in nuclear power plants not only pose a threat to the health of workers, but may also cause long-term radioactive pollution to the environment.

[0003] However, there are some common challenges in the existing nuclear power plant aerosol monitoring technology. First, due to the complexity and diversity of aerosols in nuclear power plants, aerosols from different sources may have different physical, chemical and radioactive properties, which makes continuous monitoring very difficult.

[0004] Secondly, during long-term continuous monitoring, samples from the previous monitoring may remain in the airway. These residual samples will not only affect the accuracy of the next monitoring, but may also cause damage to the monitoring equipment.

[0005] In addition, the spent fuel in nuclear power plant reactors is deeply burned up, and the fission yield of radioactive iodine is high. 129 The half-life of I is 1.57×10 7 Years, it has long-term harm to human body and environment. 129 It is necessary to monitor the radioactivity of I. However, due to the 85 The activity ratio of Kr 129 I high 10 6 magnitude, so monitoring 129 I radioactivity, it is necessary to remove 85 The influence of Kr on the measurement results. Summary of the invention

[0006] The purpose of the present invention is to provide an aerosol continuous monitoring device and a monitoring method for acid-proof iodine-129, which can continuously monitor different monitoring samples and, after solution monitoring, reversely clean the filter medium and the solution storage part, as well as the gas sample to avoid affecting the accuracy of subsequent monitoring, and can use the aerosol continuous monitoring device to accurately monitor acid-proof iodine-129.

[0007] The technical solution adopted by the present invention is as follows:

[0008] An aerosol continuous monitoring device comprises a body, an inner cavity of the body is provided with a ventilation component, the top of the body is fixedly connected with an exhaust component, a monitoring component is provided in the middle of the inner cavity of the body, and a cleaning component is provided in the monitoring component;

[0009] A ventilation assembly, the ventilation assembly comprising a pipe assembly fixedly connected to the inner cavity of the machine body, the inner cavity of the pipe assembly being provided with a channel changing assembly;

[0010] A monitoring component, the monitoring component comprising a driving component disposed in the inner cavity of the body, the inner cavity of the body being provided with a solution component;

[0011] A cleaning component, the cleaning component includes a flushing component arranged in the body cavity, and a drainage component is arranged at the bottom of the solution component;

[0012] Wherein, when the aerosol gas sample contacts the driving component through the pipeline component, the driving component filters out the aerosol particles, and the particles are dissolved and monitored through the solution component;

[0013] When the sample monitoring is completed, the flushing component flushes the residual sample in the solution component and discharges it through the drainage component. The channel changing component rotates along the inner cavity of the pipeline component, switches the path of the inner cavity of the pipeline component, and blows air in the opposite direction to the pipeline component, driving the residual sample in the pipeline component into the exhaust component.

[0014] In a preferred embodiment, the pipeline assembly includes a sample tube fixedly connected to the inner cavity of the body, an air inlet is opened on the left side of the top of the sample tube, and the right side of the top is connected to the air supply pipe, an exhaust pipe is opened on the top of the bottom end of the sample tube, and an air blowing pipe is opened on the bottom of the bottom end, an air pump is fixedly connected to the bottom right side of the body, and the top outlet of the air pump is connected to the air blowing pipe.

[0015] In a preferred embodiment, the lane changing assembly includes a first ball core rotatably connected to the top of the sample tube, the top of the sample tube is fixedly connected to a first motor, the output shaft of the first motor is fixedly connected to the top of the first ball core, the bottom of the sample tube is rotatably connected to a second ball core, the right side of the bottom of the sample tube is fixedly connected to a second motor, and the output shaft of the second motor is fixedly connected to the right end of the second ball core.

[0016] In a preferred embodiment, the exhaust assembly includes a filter box fixedly connected to the top of the machine body, the inner cavity of the filter box is movably connected with multiple groups of filter plates, the top of the filter box is provided with a slot, the inner cavity of the filter plate is slidably connected with an insertion block, the insertion block is located on one side of the inner cavity of the filter plate and is fixedly connected with a pull rope, the pull rope is movably sleeved in the filter plate, and the top end of the pull rope extends out of the filter plate, the inner cavity of the filter plate is fixedly connected with a spring, and the other end of the spring is fixedly connected to the insertion block.

[0017] In a preferred solution, the driving assembly includes a third motor fixedly connected to the inner cavity of the machine body, a rotating frame fixedly connected to the output shaft of the third motor, and a filter medium fixedly connected to the inner cavity of the rotating frame.

[0018] In a preferred embodiment, the solution component includes a solution cavity opened in the inner cavity of the body, a solution tank is fixedly connected to the bottom rear side of the body, a first liquid pump is fixedly connected to the top of the solution tank, an inlet of the first liquid pump is connected to the solution tank, an outlet of the first liquid pump is connected to a liquid delivery pipe, an outlet of the liquid delivery pipe is connected to a liquid spray plate, and an outlet of the liquid spray plate is in contact with a filter medium.

[0019] In a preferred embodiment, the flushing assembly includes a second liquid pump fixedly connected to the rear side of the machine body, the outlet of the second liquid pump is connected to a water distribution pipe, the outlet of the water distribution pipe is connected to multiple groups of upper shower plates and lower shower plates, the bottom outlets of the upper shower plates are all arranged at the top of the inner cavity of the solution cavity, and the bottom outlet of the lower shower plate is arranged on the right side of the filter medium located on the front side of the machine body.

[0020] In a preferred embodiment, the drainage assembly includes a drainage pipe connected to the bottom of the solution chamber, and the bottom outlet of the drainage pipe extends out of the rear side of the body and is connected to a collecting pipe.

[0021] In a preferred embodiment, the outer ring of the rotating frame is annularly provided with three groups of metal rings, and the filter media are all arranged in the three groups of metal rings, wherein the filter medium located at the top extends into the sample tube, the filter medium located at the front side contacts the lower shower plate, and the filter medium located at the rear side contacts the spray plate, and the body is also provided with an empty groove in the area on the left side of the lower shower plate, and the drain pipe is also connected to the bottom of the empty groove.

[0022] In a preferred embodiment, a method for monitoring acid-proof iodine-129 is characterized in that the above-mentioned aerosol continuous monitoring device is used to monitor acid-proof iodine-129, comprising:

[0023] S1: Prepare the continuous monitoring instrument in advance. The continuous monitoring instrument consists of two aerosol continuous monitoring devices mentioned above, one local processing display unit, one acid-proof pump, one electrical box, one flow meter, two differential pressure gauges, and one equipment rack;

[0024] S2: The gas to be tested containing Kr-85 and I-129 nuclides in the process pipeline is pumped into the filter valve, and the filter valve filters the radioactive aerosol and impurity clusters in the gas to be tested. The mixed gas treated by the filter valve enters the aerosol continuous monitoring device 1;

[0025] S3: I-129 is monitored in the aerosol continuous monitoring device 1, so the measurement value uploaded by the detection device to the on-site processing box is the mixed count value of the area of ​​interest, that is, the mixed count value of Kr-85 in the Compton Flat of the area of ​​interest and I-129, and the data format is address-count. When the mixed gas passes through the aerosol continuous monitoring device 1 and enters the aerosol continuous monitoring device 2, the measurement value of the aerosol continuous monitoring device 2 is the count of Kr-85 in the Compton Flat of the area of ​​interest;

[0026] S4: The processing box queries the real-time CPS values ​​of the two aerosol continuous monitoring devices, recorded as CPS1 and CPS2, and calculates their differential count n. After the gas passes through the aerosol continuous monitoring device, the original electrical signal is filtered and amplified by the operational amplifier circuit board and transmitted to the ADC, and a digital signal is formed through analog-to-digital conversion;

[0027] S5: The local processing and display unit is used to calculate, analyze and display the data uploaded by the detector, and to issue alarms and make status judgments based on the alarm thresholds, while controlling the start and stop of the pump.

[0028] The technical effects achieved by the present invention are:

[0029] The driving component and solution component of the present invention can continuously monitor different monitoring samples. When monitoring, the sample contacts the filter part of the driving component through the pipeline component, and blocks suitable particles on the filter part. Then, the driving part of the driving component drives the filter part to rotate, and drives the filter part contacting the sample to contact the solution component. Then, the solution component sprays the solution to monitor the particles on the filter part to obtain data. Since the driving component is provided with three groups of filter parts, when the filter part containing the sample is being monitored for precipitation, another group of filter parts will be inserted into the pipeline component for the next monitoring when the driving component rotates, thereby realizing continuous monitoring.

[0030] The flushing component and the liquid discharge component of the present invention can flush the filter medium and the solution storage part after the solution monitoring to avoid affecting the accuracy of the subsequent monitoring. After the solution monitoring, the flushing part of the flushing component flushes and cleans the solution storage part of the solution component, and the flushed liquid is discharged through the liquid discharge component.

[0031] The ventilation assembly and exhaust assembly of the present invention can back-clean the gas samples inside the device and filter the exhausted gas samples. After the sample monitoring is completed, the channel changing assembly rotates to change the inlet and outlet of the pipeline part of the pipeline assembly. Then the blowing part of the pipeline assembly blows air into the pipeline part to blow the residual sample in the pipeline part into the exhaust assembly, filter the residual sample, and exhaust the filtered gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a cross-sectional schematic diagram of the whole of the present invention;

[0034] Figure 3 is a cross-sectional schematic diagram of a pipeline assembly in the present invention;

[0035] Figure 4 is a cross-sectional schematic diagram of a lane changing assembly in the present invention;

[0036] Figure 5 It is a schematic diagram of the disassembly of the exhaust assembly in the present invention;

[0037] Figure 6 is a cross-sectional schematic diagram of the exhaust assembly of the present invention;

[0038] Figure 7 The present invention Figure 6 The enlarged view of point A in the middle;

[0039] Figure 8 It is a rear view schematic diagram of the whole of the present invention;

[0040] Fig. 9 is a rear cross-sectional view of the entirety of the present invention;

[0041] Fig.10 It is a schematic diagram of the structure of the driving component in the present invention;

[0042] Fig.11 It is a schematic diagram of the positions of the solution component and the drive component in the present invention;

[0043] Fig.12 It is a schematic diagram of the structure of the solution component in the present invention;

[0044] Fig.13 It is a schematic diagram of the structure of the cleaning component in the present invention;

[0045] Fig.14 It is a schematic diagram of the separation of the cleaning component and the solution component in the present invention;

[0046] Fig.15 The present invention discloses a flow chart of an acid-proof iodine-129 continuous monitoring method.

[0047] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0048] 10. Body; 20. Ventilation assembly; 21. Pipe assembly; 211. Sample tube; 212. Air inlet; 213. Air delivery pipe; 214. Exhaust pipe; 215. Air blowing pipe; 216. Air pump; 22. Channel change assembly; 221. First ball core; 222. First motor; 223. Second ball core; 224. Second motor; 30. Exhaust assembly; 31. Filter box; 32. Filter plate; 33. Slot; 34. Insert block; 35. Draw rope; 36. Spring; 40. Monitoring component; 41. Driving component; 411. Third motor; 412. Rotating frame; 413. Filter medium; 42. Solution component; 421. Solution chamber; 422. Solution tank; 423. First liquid pump; 424. Liquid delivery pipe; 425. Liquid spray plate; 50. Cleaning component; 51. Flushing component; 511. Second liquid pump; 512. Water distribution pipe; 513. Upper shower plate; 514. Lower shower plate; 52. Drainage component; 521. Drainage pipe; 522. Collecting pipe. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0052] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0053] Example 1

[0054] Please see attached Figure 1-Figure 14As shown, it is the first embodiment of the present invention, which provides an aerosol continuous monitoring device, including a body 10, an inner cavity of the body 10 is provided with a ventilation component 20, the top of the body 10 is fixedly connected with an exhaust component 30, a monitoring component 40 is provided in the middle of the inner cavity of the body 10, and a cleaning component 50 is provided in the monitoring component 40;

[0055] The ventilation assembly 20 includes a pipe assembly 21 fixedly connected to the inner cavity of the body 10, and the inner cavity of the pipe assembly 21 is provided with a channel changing assembly 22;

[0056] A monitoring component 40, the monitoring component 40 includes a driving component 41 disposed in the inner cavity of the body 10, and a solution component 42 is disposed in the inner cavity of the body 10;

[0057] The cleaning component 50 includes a flushing component 51 disposed in the inner cavity of the body 10, and a drain component 52 is disposed at the bottom of the solution component 42;

[0058] When the aerosol gas contacts the driving component 41 through the pipeline component 21, the driving component 41 filters out the aerosol particles, and the particles are dissolved and monitored through the solution component 42;

[0059] When the sample monitoring is completed, the flushing component 51 flushes the residual sample in the solution component 42 and discharges it through the drainage component 52. The channel changing component 22 rotates along the inner cavity of the pipeline component 21, switches the path of the inner cavity of the pipeline component 21, and blows air in the opposite direction to the pipeline component 21, driving the residual sample in the pipeline component 21 into the exhaust component 30.

[0060] It should be noted that the inner cavity of the body 10 is provided with a plurality of groups of annular slots for storing the driving assembly 41 and the solution assembly 42, so as to monitor particles of different sizes and improve the diversity of monitoring.

[0061] In this embodiment, after the sample enters the pipeline component 21, it contacts the filter part of the driving component 41. The driving component 41 intercepts the aerosol particles in the sample through the built-in filter part. After these particles are intercepted, they are dissolved by a specific solution as the solution component 42 operates, and then the subsequent monitoring steps are carried out. After the sample monitoring is completed, in order to keep the equipment clean and accurate, the cleaning component 50 starts to work, and the flushing component 51 sends the cleaning liquid into the body 10 to flush the solution storage part and the filter part in the solution component 42. This flushing process can not only effectively remove the residual sample, but also flush out the impurities that may be attached to the inner wall of the equipment to ensure the accuracy of the next monitoring. The flushed liquid and the dissolved sample solution are discharged through the drain component 52. At the same time, the channel change component 22 starts to work after the sample monitoring is completed, and changes the inlet and outlet direction of the pipeline part in the pipeline component 21. Next, the blowing part of the pipeline component 21 works to blow air into the pipeline part, blowing the residual sample in the pipeline part into the exhaust component 30. The exhaust component 30 filters the blown residual sample and then discharges it from the equipment.

[0062] Next, please refer to Figure 2-Figure 4 The pipeline assembly 21 includes a sample tube 211 fixedly connected to the inner cavity of the body 10, an air inlet 212 is provided on the left side of the top of the sample tube 211, and the right side of the top is connected to the air supply pipe 213, an exhaust pipe 214 is provided on the top of the bottom end of the sample tube 211, and an air blowing pipe 215 is provided on the bottom of the bottom end, an air pump 216 is fixedly connected to the bottom right side of the body 10, and the top outlet of the air pump 216 is connected to the air blowing pipe 215;

[0063] The lane changing assembly 22 includes a first ball core 221 rotatably connected to the top of the sample tube 211, a first motor 222 is fixedly connected to the top of the sample tube 211, an output shaft of the first motor 222 is fixedly connected to the top of the first ball core 221, a second ball core 223 is rotatably connected to the bottom of the sample tube 211, a second motor 224 is fixedly connected to the right side of the bottom of the sample tube 211, and an output shaft of the second motor 224 is fixedly connected to the right end of the second ball core 223.

[0064] It should be noted that L-shaped channels are provided in the first ball core 221 and the second ball core 223, and a sealing layer is provided at the portion where the first ball core 221 and the second ball core 223 contact the sample tube 211;

[0065] The sample tube 211 is provided with a plurality of access ports for facilitating the introduction of inert gas into the pipeline to improve safety.

[0066] In this embodiment, the sample tube 211 is connected to the sample gas from the air inlet 212, and the sample gas is discharged from the exhaust pipe 214 after the detection is completed. In the cleaning stage after the detection is completed, the first motor 222 and the second motor 224 respectively drive the first ball core 221 and the second ball core 223 to rotate, so that the original channel path of "air inlet 212-sample tube 211-exhaust pipe 214" is changed to "air blowing pipe 215-sample tube 211-air supply pipe 213", and then the air pump 216 is started to blow gas into the sample tube 211 through the air blowing pipe 215, and blow the residual sample into the exhaust assembly 30.

[0067] Next, please refer to Figure 4-Figure 7 The exhaust assembly 30 includes a filter box 31 fixedly connected to the top of the body 10, and a plurality of filter plates 32 are movably inserted into the inner cavity of the filter box 31. A slot 33 is provided on the top of the filter box 31, and an insert block 34 is slidably connected to the inner cavity of the filter plate 32. The insert block 34 is located on one side of the inner cavity of the filter plate 32 and is fixedly connected with a pull rope 35. The pull rope 35 is movably sleeved in the filter plate 32, and the top end of the pull rope 35 extends out of the filter plate 32. A spring 36 is fixedly connected to the inner cavity of the filter plate 32, and the other end of the spring 36 is fixedly connected to the insert block 34.

[0068] It should be noted that the plug block 34 is provided with two blocks, the front and rear blocks, and the front and rear blocks 34 are connected by a pull rope 35, so as to use one set of pull ropes 35 to drive the two sets of plug blocks 34 to move.

[0069] In this embodiment, after the residual sample gas enters the filter box 31, it is filtered by multiple groups of filter plates 32 to remove harmful substances and impurities in the residual sample. The removal and replacement process of the filter plate 32 is simple and quick. It only needs to pull the pull rope 35 on the top, and the pull rope 35 drives the front and rear plug blocks 34 to move inward at the same time until the plug blocks 34 are completely separated from the slots 33. At this time, the filter plate 32 loses its fixation and can be easily taken out of the filter box 31. When replacing a new filter plate 32, it only needs to insert the new filter plate 32 into the corresponding position of the filter box 31, align the plug blocks 34 with the slots 33, and then release the pull rope 35. The elastic force of the spring 36 automatically inserts the plug blocks 34 into the slots 33, and the filter plate 32 can be fixed.

[0070] Next, please refer to Figure 2 , Figure 8-Figure 14 The driving assembly 41 includes a third motor 411 fixedly connected to the inner cavity of the body 10, a rotating frame 412 is fixedly connected to the output shaft of the third motor 411, and a filter medium 413 is fixedly connected to the inner cavity of the rotating frame 412;

[0071] The solution assembly 42 includes a solution cavity 421 opened in the inner cavity of the body 10, a solution tank 422 is fixedly connected to the bottom of the rear side of the body 10, a first liquid pump 423 is fixedly connected to the top of the solution tank 422, an inlet of the first liquid pump 423 is connected to the solution tank 422, an outlet of the first liquid pump 423 is connected to a liquid delivery pipe 424, an outlet of the liquid delivery pipe 424 is connected to a liquid spray plate 425, and an outlet of the liquid spray plate 425 is in contact with and connected to the filter medium 413;

[0072] The flushing assembly 51 includes a second liquid pump 511 fixedly connected to the rear side of the body 10, the outlet of the second liquid pump 511 is connected to a water distribution pipe 512, and the outlet of the water distribution pipe 512 is connected to multiple groups of upper shower plates 513 and lower shower plates 514, the bottom outlets of the upper shower plates 513 are all arranged at the top of the inner cavity of the solution cavity 421, and the bottom outlet of the lower shower plate 514 is arranged on the right side of the filter medium 413 located at the front side of the body 10;

[0073] The drainage assembly 52 includes a drainage pipe 521 connected to the bottom of the solution chamber 421. The bottom outlet of the drainage pipe 521 extends out of the rear side of the body 10 and is connected to a collection pipe 522.

[0074] The outer ring of the rotating frame 412 is provided with three groups of metal rings, and the filter media 413 are all arranged in the three groups of metal rings, wherein the filter medium 413 located at the top extends into the sample tube 211, the filter medium 413 located at the front side contacts with the lower shower plate 514, and the filter medium 413 located at the rear side contacts with the spray plate 425, and the body 10 also has an empty groove in the area on the left side of the lower shower plate 514, and the drain pipe 521 is also connected to the bottom of the empty groove.

[0075] It should be noted that a transparent layer is provided in the middle of the solution box 422 to facilitate viewing of the remaining amount of solution.

[0076] In this embodiment, after the sample gas contacts the filter medium 413, the filter medium 413 adsorbs and collects the target substance in the sample gas, completing the sample collection process. Subsequently, the third motor 411 drives the rotating frame 412 to rotate slowly, driving the filter medium 413 to rotate, and the filter medium 413 carrying the sample is separated from the sample tube 211 and contacts the liquid spray plate 425. Then the first liquid pump 423 is started, and the solution is extracted from the solution tank 422 and transported to the liquid spray plate 425 through the liquid delivery pipe 424. The solution is evenly sprayed on the filter medium 413 through the nozzle of the liquid spray plate 425, so that the solution is fully in contact with the sample on the filter medium 413, so as to achieve the purpose of dissolving or eluting the target substance in the sample, and the solution carrying the sample flows into the solution chamber 421 for storage and monitoring. After the detection is completed, the filter medium 413 that has released the sample is driven to move, The second liquid pump 511 contacts the lower shower plate 514 located at the front side of the inner cavity of the body 10, and starts to work, and transports clean water to the upper shower plate 513 and the lower shower plate 514 through the water distribution pipe 512 respectively. The bottom outlet of the upper shower plate 513 sprays water on the top of the inner cavity of the solution cavity 421 to flush the solution cavity 421, while the bottom outlet of the lower shower plate 514 directly sprays water on the right side of the filter medium 413 located at the front side of the body 10 to further flush the filter medium 413 to ensure that the sample is completely dissolved or eluted. As the flushing proceeds, the solution containing the sample gradually flows into the bottom of the solution cavity 421, and is discharged from the body 10 through the drain pipe 521, and finally enters the collecting pipe 522 for discharge.

[0077] In addition, in order to ensure full utilization of the solution and reduce waste, a liquid level sensor can be set in the solution box 422. When the amount of solution is lower than a certain threshold, the system can automatically sound an alarm to remind the user to add solution in time. Finally, when the entire processing process is completed, the third motor 411 can be controlled to reverse and the filter medium 413 can be rotated back to the position of the sample tube 211 to wait for the next sample processing. At the same time, the filter box 31 can be disassembled, and the filter plate 32 can be taken out and replaced to ensure the continuous and stable operation of the system.

[0078] Example 2

[0079] Please see attached Fig.15 This embodiment provides a monitoring method for acid-proof iodine-129, which is used for any of the above-mentioned aerosol continuous monitoring devices to monitor acid-proof iodine-129, and the monitoring method comprises: S1: preparing a continuous monitoring instrument in advance, the continuous monitoring instrument consisting of two of the above-mentioned aerosol continuous monitoring devices, one on-site processing display unit, one acid-proof pump, one electrical box, one flow meter, two differential pressure gauges, and one set of equipment rack;

[0080] S2: The gas to be tested containing Kr-85 and I-129 nuclides in the process pipeline is pumped into the filter valve, and the filter valve filters the radioactive aerosol and impurity clusters in the gas to be tested. The mixed gas treated by the filter valve enters the aerosol continuous monitoring device 1;

[0081] S3: I-129 is monitored in the aerosol continuous monitoring device 1, so the measurement value uploaded by the detection device to the on-site processing box is the mixed count value of the area of ​​interest, that is, the mixed count value of Kr-85 in the Compton Flat of the area of ​​interest and I-129, and the data format is address-count. When the mixed gas passes through the aerosol continuous monitoring device 1 and enters the aerosol continuous monitoring device 2, the measurement value of the aerosol continuous monitoring device 2 is the count of Kr-85 in the Compton Flat of the area of ​​interest;

[0082] S4: The processing box queries the real-time CPS values ​​from the two aerosol continuous monitoring devices, which are recorded as CPS1 (the count value of the mixed gas) and CPS2 (the count value of krypton), and calculates the differential count n (the count value of the second iodine box absorbing iodine). After the gas passes through the aerosol continuous monitoring device, the original electrical signal is filtered and amplified by the operational amplifier circuit board and transmitted to the ADC. The digital signal is converted into a digital signal through analog-to-digital conversion, and the original event information is obtained through FPGA digital processing. In order to enhance the anti-interference ability of the signal, the output signal is uploaded to the local processing box in the form of RS485;

[0083] Wherein, the front ends of the two aerosol continuous monitoring devices are all equipped with iodine boxes, and the iodine boxes are used to absorb the iodine passing through. In the process of detection, the iodine box at the front end of the aerosol continuous monitoring device 1 absorbs a part of iodine, and now the aerosol continuous monitoring device 1 monitors the mixed count value (CPS1) of Compton's plateau and iodine in the region of interest of krypton, and the data form is address-count. Subsequently, the iodine box at the front end of the aerosol continuous monitoring device 2 absorbs the remaining iodine, and now the gas count value monitored by the aerosol continuous monitoring device 2 is the count (CPS2) of the Compton's plateau in the region of interest of krypton, thereby separating krypton from iodine to avoid affecting the result of monitoring.

[0084] S5: The local processing and display unit is used to calculate, analyze and display the data uploaded by the detector, and to issue alarms and make status judgments based on the alarm threshold, while controlling the start and stop of the pump.

[0085] It should be noted that the on-site processing display unit, electrical box, and equipment rack are the equipment required for installation and operation during the inspection process;

[0086] The flow meter is used to calculate the flow rate of the gas entering the device, and the differential pressure meter is used to calculate the pressure difference before and after two aerosol monitorings;

[0087] During the detection process, the above-mentioned aerosol continuous monitoring device and the iodine box need to be placed in the lead chamber to prevent pollution leakage.

[0088] In this embodiment, the calculation method in S4 is n=CPS1-CPS2

[0089] Where:

[0090] n—difference count;

[0091] CPS1—Real-time count of continuous aerosol monitoring system 1;

[0092] CPS2—real-time count of continuous aerosol monitoring system 2;

[0093] The processing box performs filtering and smoothing calculations on the differenced n, involving filtering constant N0, filtering time t, smoothing time T0, and obtains the final differential count n i , according to n i The concentration of I-129 is calculated by formula (2):

[0094] Formula (2):

[0095]

[0096] In formula (2):

[0097] C——Currently displayed concentration value, unit Bq / m 3 ;

[0098] n i +1——the average count rate of the i+1th T period, in Hz;

[0099] n i ——The average count rate of the ith T period, in Hz;

[0100] n ab ——Instrument environmental background count, unit: Hz;

[0101] λ—— 129 The decay constant of I is 1.4×10-15s-1;

[0102] S——Instrument sensitivity, unit: Hz / Bq;

[0103] Q——sample flow rate, unit: m 3 / h;

[0104] T—get a count rate n i or i+1 The required measurement time, in seconds;

[0105] In the later period of the interval of interest, according to the experimental results, the two aerosol continuous monitoring devices are written through the processing box. Before use, the Am-241 source is used to calibrate the two monitoring devices to ensure the consistency of the two monitoring devices, and the second detection device is used to calibrate the detected data to ensure accuracy. At the same time, the amount of iodine-129 deposited on the second iodine box can also be reflected and judged according to the above calculation formula. Specifically, the difference n is obtained by CPS1 (the mixed gas count of iodine and krypton after the first iodine box adsorption) - CPS2 (the mixed gas count of iodine and krypton after the second iodine box adsorption). i， , at this time n i The result is the amount of iodine absorbed by the second iodine box.

[0106] At the same time, in addition to judging whether the iodine box needs to be replaced according to the pressure difference of the differential pressure gauge at both ends of the iodine box, if the residual iodine content is detected in CPS2, the iodine box needs to be replaced. By combining the above two methods, the replacement of the iodine box is more flexible.

[0107] After the test is completed, the impurities remaining in the equipment are cleaned through the backwash process mentioned above to avoid affecting the accuracy of the next test.

[0108] The working principle of the present invention is as follows: the sample tube 211 is connected to the sample gas from the air inlet 212, so that the sample gas contacts the filter medium 413. After the contact, the filter medium 413 adsorbs and collects the target substance in the sample gas, completing the sample collection process. Subsequently, the third motor 411 drives the rotating frame 412 to rotate slowly, driving the filter medium 413 to rotate, so that the filter medium 413 carrying the sample is separated from the sample tube 211 and contacts the liquid spray plate 425. Then, the first liquid pump 423 is started, and the solution is extracted from the solution tank 422 and transported to the liquid spray plate 425 through the liquid delivery pipe 424. The solution is evenly sprayed on the filter medium 413 through the nozzle of the liquid spray plate 425, so that the solution is fully in contact with the sample on the filter medium 413, so as to achieve the purpose of dissolving or eluting the target substance in the sample, and the solution carrying the sample is The sample flows into the solution chamber 421 for storage and monitoring. After the test is completed, the filter medium 413 that has released the sample is driven to move and contacts the lower shower plate 514 located at the front side of the inner cavity of the body 10. The second liquid pump 511 starts to work and transports clean water to the upper shower plate 513 and the lower shower plate 514 through the water distribution pipe 512. The bottom outlet of the upper shower plate 513 sprays water on the top of the inner cavity of the solution chamber 421 to rinse the solution chamber 421, while the bottom outlet of the lower shower plate 514 sprays water directly on the right side of the filter medium 413 located at the front side of the body 10, further The filter medium 413 is rinsed to ensure that the sample is completely dissolved or eluted. As the rinsing proceeds, the solution containing the sample gradually flows into the bottom of the solution cavity 421, and is discharged from the body 10 through the drain pipe 521, and finally enters the collection pipe 522 for discharge. On the other hand, the sample gas is discharged from the exhaust pipe 214 after the detection is completed. In the cleaning stage after the detection is completed, the first motor 222 and the second motor 224 drive the first ball core 221 and the second ball core 223 to rotate respectively, so that the original channel path of "gas inlet 212-sample tube 211-exhaust pipe 214" is changed to "blowing Air pipe 215-sample tube 211-air delivery pipe 213", then the air pump 216 is started, and gas is blown into the sample tube 211 through the air blowing pipe 215, and the residual sample is blown into the filter box 31. After filtering through multiple groups of filter plates 32, the harmful substances and impurities in the residual sample are removed and then discharged. When the filter plate 32 needs to be replaced, it is only necessary to pull the pull rope 35 on the top, and the pull rope 35 drives the front and rear plug blocks 34 to move inward at the same time until the plug blocks 34 are completely detached from the slots 33. At this time, the filter plate 32 loses its fixation and can be easily taken out of the filter box 31. When replacing a new filter plate 32, it is only necessary to insert the new filter plate 32 into the corresponding position of the filter box 31, align the plug block 34 with the slot 33, and then release the pull rope 35. The elastic force of the spring 36 causes the plug block 34 to automatically insert into the slot 33, and the filter plate 32 can be fixed.

[0109] The above are only preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the art unless otherwise specified and limited.

Claims

1. An aerosol continuous monitoring device, characterized in that: include: A machine body (10), wherein an inner cavity of the machine body (10) is provided with a ventilation component (20), an exhaust component (30) is fixedly connected to the top of the machine body (10), a monitoring component (40) is provided in the middle of the inner cavity of the machine body (10), and a cleaning component (50) is provided in the monitoring component (40); A ventilation assembly (20), the ventilation assembly (20) comprising a pipe assembly (21) fixedly connected to the inner cavity of the body (10), the inner cavity of the pipe assembly (21) being provided with a channel changing assembly (22); A monitoring component (40), the monitoring component (40) comprising a driving component (41) disposed in an inner cavity of a body (10), the inner cavity of the body (10) being provided with a solution component (42); A cleaning component (50), the cleaning component (50) comprising a flushing component (51) arranged in the inner cavity of the body (10), and a drainage component (52) is arranged at the bottom of the solution component (42); When the aerosol gas sample contacts the driving component (41) through the pipeline component (21), the driving component (41) filters out aerosol particles, and the particles are dissolved and monitored through the solution component (42); When the sample monitoring is completed, the flushing component (51) flushes the residual sample in the solution component (42) and discharges it through the drainage component (52), and the channel switching component (22) rotates along the inner cavity of the pipeline component (21), switches the path of the inner cavity of the pipeline component (21), and blows air in the opposite direction to the pipeline component (21), driving the residual sample in the pipeline component (21) into the exhaust component (30).

2. The aerosol continuous monitoring device according to claim 1, characterized in that: The pipeline assembly (21) comprises a sample tube (211) fixedly connected to the inner cavity of the body (10); an air inlet (212) is provided on the left side of the top of the sample tube (211), and the right side of the top is connected to an air supply pipe (213); an exhaust pipe (214) is provided on the top of the bottom end of the sample tube (211), and an air blowing pipe (215) is provided on the bottom of the bottom end; an air pump (216) is fixedly connected to the bottom right side of the body (10), and the top outlet of the air pump (216) is connected to the air blowing pipe (215).

3. The aerosol continuous monitoring device according to claim 2, characterized in that: The lane changing assembly (22) comprises a first ball core (221) rotatably connected to the top of a sample tube (211); a first motor (222) is fixedly connected to the top of the sample tube (211); an output shaft of the first motor (222) is fixedly connected to the top of the first ball core (221); a second ball core (223) is rotatably connected to the bottom of the sample tube (211); a second motor (224) is fixedly connected to the right side of the bottom of the sample tube (211); and an output shaft of the second motor (224) is fixedly connected to the right end of the second ball core (223).

4. The aerosol continuous monitoring device according to claim 1, characterized in that: The exhaust assembly (30) comprises a filter box (31) fixedly connected to the top of the machine body (10); a plurality of groups of filter plates (32) are movably inserted into the inner cavity of the filter box (31); a slot (33) is provided at the top of the filter box (31); an insert block (34) is slidably connected to the inner cavity of the filter plate (32); a pull rope (35) is fixedly connected to one side of the insert block (34) located in the inner cavity of the filter plate (32); the pull rope (35) is movably sleeved in the filter plate (32), and the top end of the pull rope (35) extends out of the filter plate (32); a spring (36) is fixedly connected to the inner cavity of the filter plate (32); the other end of the spring (36) is fixedly connected to the insert block (34).

5. The aerosol continuous monitoring device according to claim 2, characterized in that: The driving assembly (41) comprises a third motor (411) fixedly connected to the inner cavity of the machine body (10); a rotating frame (412) is fixedly connected to the output shaft of the third motor (411); and a filter medium (413) is fixedly connected to the inner cavity of the rotating frame (412).

6. The aerosol continuous monitoring device according to claim 5, characterized in that: The solution component (42) comprises a solution cavity (421) opened in the inner cavity of the body (10); a solution tank (422) is fixedly connected to the bottom of the rear side of the body (10); a first liquid pump (423) is fixedly connected to the top of the solution tank (422); an inlet of the first liquid pump (423) is connected to the solution tank (422); an outlet of the first liquid pump (423) is connected to a liquid delivery pipe (424); an outlet of the liquid delivery pipe (424) is connected to a liquid spray plate (425); and an outlet of the liquid spray plate (425) is in contact with and connected to a filter medium (413).

7. The aerosol continuous monitoring device according to claim 6, characterized in that: The flushing assembly (51) comprises a second liquid pump (511) fixedly connected to the rear side of the machine body (10); the outlet of the second liquid pump (511) is connected to a water distribution pipe (512); the outlet of the water distribution pipe (512) is connected to a plurality of groups of upper flushing plates (513) and lower flushing plates (514); the bottom outlets of the upper flushing plates (513) are all arranged at the top of the inner cavity of the solution cavity (421); and the bottom outlets of the lower flushing plates (514) are arranged on the right side of the filter medium (413) located at the front side of the machine body (10).

8. The aerosol continuous monitoring device according to claim 7, characterized in that: The drainage assembly (52) comprises a drainage pipe (521) connected to the bottom of the inner cavity of the solution cavity (421); the bottom outlet of the drainage pipe (521) extends out of the rear side of the machine body (10) and is connected to a collecting pipe (522).

9. The aerosol continuous monitoring device according to claim 8, characterized in that: The outer ring of the rotating frame (412) is provided with three groups of metal rings in an annular shape, and the filter media (413) are all arranged in the three groups of metal rings, wherein the filter medium (413) located at the top extends into the sample tube (211), the filter medium (413) located at the front side contacts the lower shower plate (514), and the filter medium (413) located at the rear side contacts the liquid spraying plate (425), and the body (10) is also provided with an empty groove in the area on the left side of the lower shower plate (514), and the drain pipe (521) is also connected to the bottom of the empty groove.

10. A method for monitoring acid-proof iodine-129, characterized in that: The aerosol continuous monitoring device according to any one of claims 1 to 9 is used for acid-proof iodine-129 monitoring, comprising: S1: Prepare the continuous monitoring instrument in advance. The continuous monitoring instrument consists of two aerosol continuous monitoring devices mentioned above, one local processing display unit, one acid-proof pump, one electrical box, one flow meter, two differential pressure gauges, and one equipment rack; S2: The gas to be tested containing Kr-85 and I-129 nuclides in the process pipeline is pumped into the filter valve, and the filter valve filters the radioactive aerosol and impurity clusters in the gas to be tested. The mixed gas treated by the filter valve enters the aerosol continuous monitoring device 1; S3: I-129 is monitored in the aerosol continuous monitoring device 1, so the measurement value uploaded by the detection device to the on-site processing box is the mixed count value of the area of ​​interest, that is, the mixed count value of Kr-85 in the Compton Flat of the area of ​​interest and I-129, and the data format is address-count. When the mixed gas passes through the aerosol continuous monitoring device 1 and enters the aerosol continuous monitoring device 2, the measurement value of the aerosol continuous monitoring device 2 is the count of Kr-85 in the Compton Flat of the area of ​​interest; S4: The processing box queries the real-time CPS values ​​of the two aerosol continuous monitoring devices, recorded as CPS1 and CPS2, and calculates their differential count n. After the gas passes through the aerosol continuous monitoring device, the original electrical signal is filtered and amplified by the operational amplifier circuit board and transmitted to the ADC, and a digital signal is formed through analog-to-digital conversion; S5: The local processing and display unit is used to calculate, analyze and display the data uploaded by the detector, and to issue alarms and make status judgments based on the alarm thresholds, while controlling the start and stop of the pump.

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